Ruby-on-rails 获取请求的内容类型
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Get Content Type of Request
提问by mahemoff
To find the incoming content type, docs say:
要查找传入的内容类型，文档说：
request.headers["Content-Type"] # => "text/plain"
But I found by trial-and-error, that doesn't work, but this does:
但我通过反复试验发现，这不起作用，但这样做：
request.headers["CONTENT_TYPE"]=='application/json'
So what's the most robust+portable way to do it?
那么最健壮+便携的方法是什么？
回答by DRobinson
I would usually go for request.formatand request.content_typefor reading these header fields.
我通常会去request.format和request.content_type读取这些字段。
EDIT: found a bit more on this that might help: https://stackoverflow.com/a/1595453/624590
编辑：在这方面找到了更多可能有帮助的信息：https: //stackoverflow.com/a/1595453/624590
回答by Kent Mewhort
You don't need to parse the content_type string, Rails has already done this for you. Just check:
您不需要解析 content_type 字符串，Rails 已经为您完成了。只需检查：
request.format.symbol == :json
回答by montrealmike
Another way of writing it:
另一种写法：
request.format.json?
回答by Tim Scott
No need to call #symbol since equals is overloaded:
无需调用 #symbol，因为 equals 已重载：
request.format == :json
回答by amn
request.format == 'application/json'
request.format == '应用程序/json'
回答by Leszek
For me the best way to check if incoming request is a json was:
对我来说，检查传入请求是否为 json 的最佳方法是：
if request.content_type =~ /json/
